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Preparation method and applications of flower-like ferroferric oxide-molybdenum disulfide-manganese dioxide nano-complex

A technology of triiron tetroxide and nanocomposite, which is applied in the directions of iron oxide/iron hydroxide, molybdenum sulfide, ferrous iron oxide, etc., can solve the problems of small specific surface area and low activity of molybdenum disulfide, etc. Effect of simplicity, low cost, and superior nitrite properties

Active Publication Date: 2020-04-17
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure molybdenum disulfide has low activity and small specific surface area

Method used

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  • Preparation method and applications of flower-like ferroferric oxide-molybdenum disulfide-manganese dioxide nano-complex
  • Preparation method and applications of flower-like ferroferric oxide-molybdenum disulfide-manganese dioxide nano-complex
  • Preparation method and applications of flower-like ferroferric oxide-molybdenum disulfide-manganese dioxide nano-complex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] (1) Weigh 30 grams of ferric chloride hexahydrate and 15 grams of ferric sulfide in 250 ml of deionized water, inject nitrogen gas for 20 minutes and stir until transparent;

[0070] (2) Stir the mixed solution obtained in step (1) at 60°C for 5 minutes, add ammonia water, and age at 70°C for 30 minutes to obtain ferric oxide;

[0071] (3) Weigh 0.3g sodium molybdate and 0.4g thiourea respectively in deionized water and stir evenly;

[0072] (4) Weigh 0.4 g of the ferric oxide obtained in step (3), stir at room temperature for 40 minutes, transfer to an autoclave, and react at 200 °C for 24 hours;

[0073] (5) After centrifuging the reaction product of step (4) to remove water, first wash with ethanol to remove unreacted organic matter, then wash with deionized water to remove unreacted inorganic ions, and place the cleaned reaction product in an oven drying at 70°C to obtain ferric oxide-molybdenum disulfide nanocomposites;

[0074] (6) Weigh 0.5g of manganese sulfat...

Embodiment 2

[0083] The three-electrode system prepared in Example 1 was placed in a place not containing and containing 0.5, 1, 2, 4 mmol dm -3 0.1 mol dm of sodium nitrite -3 In the phosphate buffer solution, the catalytic performance of the ferric oxide-molybdenum disulfide-manganese dioxide complex to nitrite was determined by cyclic voltammetry, the cyclic voltammetry diagram is as follows figure 2 shown.

[0084] figure 2 Modified glassy carbon electrodes for ferric oxide-molybdenum disulfide-manganese dioxide composites without and with 0.5, 1, 2, 4 mmol dm -3 0.1 mol dm of sodium nitrite -3 Cyclic voltammogram in phosphate buffer solution. It can be seen from the figure that when the composite-modified glassy carbon electrode was moved from the phosphate buffer solution to the solution containing sodium nitrite, an oxidation peak appeared near 0.7V, and with the increase of the nitrite concentration, the peak current increases. This result indicated that the reduction react...

Embodiment 3

[0087] The three-electrode system prepared in Example 1 was placed in a 0.1 mol dm -3 In the phosphate buffer solution, sodium nitrite solutions of different concentrations were added dropwise, and the response current values ​​corresponding to the sodium nitrite solutions of different concentrations were respectively measured by the constant potential method, and the linear relationship diagram between the concentration of nitrite and the response current was obtained ( image 3 );

[0088] From image 3 It can be seen in the figure that the glassy carbon electrode pair of ferric oxide-molybdenum disulfide-manganese dioxide composite modified 0.1mmoldm -3 Any nitrite can respond. Figure 4 is true image 3 The graph of nitrite concentration and response current. It can be seen from the figure: in the range of 5.0 to 3400µmol dm -3 A good linear relationship is maintained in the range.

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Abstract

The invention relates to a preparation method and applications of a flower-like ferroferric oxide-molybdenum disulfide-manganese dioxide nano complex. The preparation method comprises the following steps: dispersing ferric chloride and ferric sulfide in deionized water, adding ammonia water, and aging to obtain ferroferric oxide; adding sodium molybdate and thiourea into deionized water, uniformlystirring, adding the ferroferric oxide, transferring into a high-pressure reaction kettle, and carrying out a reaction; centrifugally separating, cleaning with ethanol and deionized water, and dryingto obtain a ferroferric oxide-molybdenum disulfide finished product; dissolving a proper amount of the ferroferric oxide-molybdenum disulfide complex, manganese sulfate monohydrate and potassium permanganate into deionized water, uniformly stirring, transferring the mixture into a high-pressure reaction kettle, and carrying out a reaction; drying to obtain a flower-like ferroferric oxide-molybdenum disulfide-manganese dioxide finished product; and dispersing the flower-like ferroferric oxide-molybdenum disulfide-manganese dioxide nano-complex in a mixed solution of water, ethanol and perfluorosulfonic acid, and dropwisely coating the surface of a clean glassy carbon electrode with the dispersed flower-like ferroferric oxide-molybdenum disulfide-manganese dioxide nano-complex.

Description

technical field [0001] The invention relates to a preparation method and application of a flower-shaped iron ferric oxide-molybdenum disulfide-manganese dioxide nanocomposite, belonging to the technical field of environmental detection. Background technique [0002] Nitrite is widely used in daily life, it can be used as food additive and corrosion inhibitor additive, and it can also be used as inorganic fertilizer to provide nitrogen to plants and vegetables. Studies have found that excessive intake of nitrite in the diet is toxic to the human body, interferes with the oxygen transmission system in the human body, tends to damage the kidneys, spleen, and nervous system, and may even cause cancer. Therefore, the real-time detection of nitrite is a very necessary and meaningful thing. Electrochemical method is one of the commonly used methods to detect nitrite, and it is an environmentally friendly technology. Compared with fluorescence spectrophotometry, chemiluminescence a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08C01G45/02C01G39/06G01N27/416
CPCC01G49/08C01G39/06C01G45/02G01N27/4166C01P2004/80
Inventor 王宏归潘华伟张娅
Owner YANGZHOU UNIV
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